enthronisation vs enthronement

enthronisation and enthronement both are nouns.

Word	Noun	Adjective	Verb	Adverb
enthronisation	Yes	No	No	No
enthronement	Yes	No	No	No

As nouns, enthronisation and enthronement are synonyms defined as:

enthronisation and enthronement: the ceremony of installing a new monarch

Other synonyms of enthronisation include coronation, enthronization, investiture.

enthronisation (noun)	enthronement (noun)
the ceremony of installing a new monarch	the ceremony of installing a new monarch